Question

How I can put name on subquery’s output, instead of ?column??

The SELECT‘s output is:

._______.__________.__________.
|__id___|_?column?_|_?column?_|
|_31886_|____12____|____13____|

What I want is:

._______.__________.__________.
|__id___|___ages___|_validate_|
|_31886_|____12____|____13____|

What my SELECT look like:

SELECT g.id,
(select dt from pcdhidro where nomepcd=31886 order by datahora asc limit 1),
(select dt from pcdhidro_2003_96 where nomepcd=31886)
FROM gestpcd_2 g
WHERE g.tipo = 'HIDRO' and g.id = 31886

Answer 1

(Select X from Y) AS alias

So in your case:

SELECT g.id,
(select dt from pcdhidro where nomepcd=31886 order by datahora asc limit 1) as ages,
(select dt from pcdhidro_2003_96 where nomepcd=31886) as validate
FROM gestpcd_2 g
WHERE g.tipo = 'HIDRO' and g.id = 31886